Hmmm i remember our old logo. Looked like this:

I like that "O", it could stand as a logo. Maybe you can re-draw and recolor it (purple instead of red and black/grey insted of blue) and put it on the side of the armband. I think it would look cool.

I also really like WAPOW's armband design. Every side is filled and has no white spots (i'm not asking to copy it, it's just an example):